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ASTM A242 HSLA Steel vs. SAE-AISI 5140 Steel

Both ASTM A242 HSLA steel and SAE-AISI 5140 steel are iron alloys. They have a very high 98% of their average alloy composition in common.

For each property being compared, the top bar is ASTM A242 HSLA steel and the bottom bar is SAE-AISI 5140 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 150
170 to 290
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 22
12 to 29
Fatigue Strength, MPa 230
220 to 570
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 310
360 to 600
Tensile Strength: Ultimate (UTS), MPa 490
560 to 970
Tensile Strength: Yield (Proof), MPa 330
290 to 840

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 400
420
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1420
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 52
45
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.1
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 8.1
8.3

Otherwise Unclassified Properties

Base Metal Price, % relative 1.9
2.1
Density, g/cm3 7.9
7.8
Embodied Carbon, kg CO2/kg material 1.4
1.4
Embodied Energy, MJ/kg 18
19
Embodied Water, L/kg 46
49

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 95
76 to 180
Resilience: Unit (Modulus of Resilience), kJ/m3 290
220 to 1880
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 17
20 to 34
Strength to Weight: Bending, points 17
19 to 28
Thermal Diffusivity, mm2/s 14
12
Thermal Shock Resistance, points 14
16 to 29

Alloy Composition

Carbon (C), % 0 to 0.15
0.38 to 0.43
Chromium (Cr), % 0
0.7 to 0.9
Copper (Cu), % 0.2 to 0.45
0
Iron (Fe), % 98.2 to 99.8
97.3 to 98.1
Manganese (Mn), % 0 to 1.0
0.7 to 0.9
Phosphorus (P), % 0 to 0.15
0 to 0.035
Silicon (Si), % 0
0.15 to 0.35
Sulfur (S), % 0 to 0.050
0 to 0.040